Origami Platonic solids

There's something very beautiful and elegant about the simple 3D shapes known as Platonic solids. By actually building these structures, the mind and body can work together to strengthen our intuition about them. In this article, I stick with a simple and popular description of origami: you start with a single sheet of paper, and you're only allowed to fold it. The only tools allowed are your own fingers-no pencils, measuring sticks, compasses, and so on. There is one variation. We'll create most of our models by assembling several different pieces together. The assembly must not require tape or glue, though for some of the flimsier models you may want to apply a few dabs of glue here and there so that the model doesn't completely unravel if you drop it.